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NEW QUESTION: 1
Secure Sockets Layer (SSL) uses a Message Authentication Code (MAC) for what purpose?
A. message confidentiality.
B. message non-repudiation.
C. message integrity.
D. message interleave checking.
Answer: C
Explanation:
A keyed hash also called a MAC (message authentication code) is used for integrity protection and authenticity.
In cryptography, a message authentication code (MAC) is a generated value used to authenticate a message. A MAC can be generated by HMAC or CBC-MAC methods. The
MAC protects both a message's integrity (by ensuring that a different MAC will be produced if the message has changed) as well as its authenticity, because only someone who knows the secret key could have modified the message.
MACs differ from digital signatures as MAC values are both generated and verified using the same secret key. This implies that the sender and receiver of a message must agree on the same key before initiating communications, as is the case with symmetric encryption. For the same reason, MACs do not provide the property of non-repudiation offered by signatures specifically in the case of a network-wide shared secret key: any user who can verify a MAC is also capable of generating MACs for other messages.
HMAC
When using HMAC the symmetric key of the sender would be concatenated (added at the end) with the message. The result of this process (message + secret key) would be put through a hashing algorithm, and the result would be a MAC value. This MAC value is then appended to the message being sent. If an enemy were to intercept this message and modify it, he would not have the necessary symmetric key to create a valid MAC value. The receiver would detect the tampering because the MAC value would not be valid on the receiving side.
CBC-MAC
If a CBC-MAC is being used, the message is encrypted with a symmetric block cipher in
CBC mode, and the output of the final block of ciphertext is used as the MAC. The sender does not send the encrypted version of the message, but instead sends the plaintext version and the MAC attached to the message. The receiver receives the plaintext message and encrypts it with the same symmetric block cipher in CBC mode and calculates an independent MAC value. The receiver compares the new MAC value with the
MAC value sent with the message. This method does not use a hashing algorithm as does
HMAC.
Cipher-Based Message Authentication Code (CMAC)
Some security issues with CBC-MAC were found and they created Cipher-Based Message
Authentication Code (CMAC) as a replacement. CMAC provides the same type of data origin authentication and integrity as CBC-MAC, but is more secure mathematically. CMAC is a variation of CBC-MAC. It is approved to work with AES and Triple DES. HMAC, CBC-
MAC, and CMAC work higher in the network stack and can identify not only transmission errors (accidental), but also more nefarious modifications, as in an attacker messing with a message for her own benefit. This means all of these technologies can identify intentional, unauthorized modifications and accidental changes- three in one.
The following are all incorrect answers:
"Message non-repudiation" is incorrect.
Nonrepudiation is the assurance that someone cannot deny something. Typically, nonrepudiation refers to the ability to ensure that a party to a contract or a communication cannot deny the authenticity of their signature on a document or the sending of a message that they originated.
To repudiate means to deny. For many years, authorities have sought to make repudiation impossible in some situations. You might send registered mail, for example, so the recipient cannot deny that a letter was delivered. Similarly, a legal document typically requires witnesses to signing so that the person who signs cannot deny having done so.
On the Internet, a digital signature is used not only to ensure that a message or document has been electronically signed by the person that purported to sign the document, but also, since a digital signature can only be created by one person, to ensure that a person cannot later deny that they furnished the signature.
"Message confidentiality" is incorrect. The Message confidentiality is protected by encryption not by hashing algorithms.
"Message interleave checking" is incorrect. This is a nonsense term included as a distractor.
Reference(s) used for this question:
Harris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition (p. 1384). McGraw-
Hill. Kindle Edition.
and
http://csrc.nist.gov/publications/nistpubs/800-38B/SP_800-38B.pdf
and
http://searchsecurity.techtarget.com/definition/nonrepudiation
and
https://en.wikipedia.org/wiki/Message_authentication_code
NEW QUESTION: 2
Which statement best describes the differences between Cisco SMARTnet and Cisco SMARTnet Onsite?
A. Cisco SMARTnet Onsite is primarily attractive to customers who do not need to replace their hardware immediately, but would still like an onsite technician to install and replace hardware
B. Cisco SMARTnet Onsite includes certification classes and live network consulting at the customer site.
C. Cisco SMARTNet Onsite includes all of the elements of Cisco SMARTnet with the additional provision of onsite technician to perform parts replacement
D. Cisco SMARTnet Onsite provides network monitoring for small-to-medium sized businesses and provides onsite technical resources when hardware problems are detected.
Answer: C
Explanation:
Explanation/Reference:
Explanation:
NEW QUESTION: 3
Definition-use pairs are identified during which of the following static analysis activities?
A. Data flow activities
B. Coding standards analysis
C. Control flow analysis
D. Cyclomatic complexity analysis
Answer: A